Phase Locked Frequency Controller
UC1634
UC2634
UC3634
FEATURES
Precision Phase Locked Frequency Control
System
Communication Logic for 2-Phase Motors
Disable Input for Motor Inhibit
Crystal Oscillator
Programmable Reference Frequency Dividers
Phase Detector with Absolute Frequency
Steering
Digital Lock Indicator
Two High Current Op-Amps
5V Reference Output
DESCRIPTION
The UC1634 series of devices is optimized to provide precision
phase locked frequency control for two phase DC brushless mo-
tors. These devices include most of the features of the general
purpose UC1633 Phase Locked Control family and also provide
the out-of-phase commutation signals required for driving two
phase brushless motors. Only an external power booster stage
is required for a complete drive and control system.
The two commutation outputs are open collector devices that can
sink in excess of 16mA. A disable input allows the user to simul-
taneously force both of these outputs to an active low state.
Double edge logic, following the sense amplifier, doubles the ref-
erence frequency at the phase detector by responding to both
edges of the input signal at Pin 7.
BLOCK DIAGRAM
6/93
CONNECTION DIAGRAMS
UC1634
UC2634
UC3634
PACKAGE PIN FUNCTION
FUNCTION
PIN
N/C
1
DIV 2/4/8
2
Lock Indicator Output
3
Phase Detector
Output
4
Disable Input
5
N/C
6
Driver A Output
7
Driver B Output
8
Sense Amp Output
9
5V Ref Output
10
Loop Amp Inv Input
11
Loop Amp Output
12
Buffer Amp Input
13
Buffer Amp Output
14
+V
IN
15
N/C
16
OSC Output
17
OSC Input
18
Ground
19
DIV 4/5 Input
20
DIL-16, SOIC-16 (TOP VIEW)
J or N Package, DW Package
Input Supply Voltage (+VIN). . . . . . . . . . . . . . . . . . . . . . . . +20V
Reference Output Current . . . . . . . . . . . . . . . . . . . . . . . -30mA
Op-Amp Output Currents . . . . . . . . . . . . . . . . . . . . . . . .
30mA
Op-Amp Input Voltages . . . . . . . . . . . . . . . . . . . . . -.3V to +20V
Phase Detector Output Current . . . . . . . . . . . . . . . . . . .
10mA
Lock Indicator Output Current . . . . . . . . . . . . . . . . . . . . +15mA
Lock Indicator Output Voltage . . . . . . . . . . . . . . . . . . . . . . +20V
Divide Select Input Voltage . . . . . . . . . . . . . . . . . . -.3V to +10V
Disable Input Voltage . . . . . . . . . . . . . . . . . . . . . . . -.3V to +10V
Oscillator Input Voltage . . . . . . . . . . . . . . . . . . . . . . -.3V to +5V
Sense Amplifier Input Voltage . . . . . . . . . . . . . . . . -.3V to +20V
Driver Output Currents . . . . . . . . . . . . . . . . . . . . . . . . . . +30mA
Driver Output Voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . . +20V
Power Dissipation at T
A
= 25C(Note 2) . . . . . . . . . . . 1000mW
Power Dissipation at T
C
= 25C (Note 2) . . . . . . . . . . . 2000mW
Operating Junction Temperature . . . . . . . . . . . -55C to +150C
Storage Temperature . . . . . . . . . . . . . . . . . . . . -65C to +150C
Lead Temperature (Soldering, 10 Seconds) . . . . . . . . . . 300C
PLCC-20 (TOP VIEW)
Q Package
Note 1: Voltages are referenced to ground, (Pin 16, DIL Pack-
age). Currents are positive into, negative out of, the specified
terminals.
Note 2: Consult Packaging Section of Databook for thermal
limitations and considerations of package.
ABSOLUTE MAXIMUM RATINGS (Note 1, 2)
PARAMETERS
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Supply Current
+V
IN
= 15V
20
29
mA
Reference
Output Voltage (V
REF)
4.75
5.0
5.25
V
Load Regulation
I
OUT
= 0mA to 7mA
5.0
20
mV
Line Regulation
+V
IN
= 8V to 15V
2.0
20
mV
Short Circuit Current
V
OUT
= 0V
12
30
mA
Oscillator
DC Voltage Gain
Oscillator In to Oscillator Out
12
16
20
dB
Input DC Level (V
IB
)
Oscillator In Pin Open, T
J
= 25C
1.15
1.3
1.45
V
Input Impedance (Note 3)
V
IN
= V
IB
0.5V, T
J
= 25C
1.3
1.6
1.9
k
Output DC Level
Oscillator In Pin Open, T
J
= 25C
1.2
1.4
1.6
V
Maximum Operating Frequency
10
MHz
Dividers
Maximum Input Frequency
Input = 1V
PP
at Oscillator In
10
MHz
Div. 4/5 Input Current
Input = 5V (Div. by 4)
150
500
A
(Q Package Only, Note 4)
Input = 0V (Div. by 5)
-5.0
0.0
5.0
A
Unless otherwise stated, these specifications apply for T
A
= 0C to +70C for the
UC3634, -25C to + 85C for the UC2634 and -55C to +125C for the UC1634,
+V
IN =
12V. T
A
=T
J.
ELECTRICAL CHARACTERISTICS:
2
PARAMETERS
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Dividers (cont.)
Div. 4/5 Input Threshold
(Q Package Only, Note 4)
0.5
1.6
2.2
V
Div. 2/4/8 Input Current
Input = 5V (Div. by 8)
150
500
A
Input = 0V (Div. by 2)
-500
-150
A
Div. 2/4/8 Open Current Voltage
Input Current = 0
A (Div. by 4)
1.5
2.5
3.5
V
Div. by 2 Threshold
0.20
0.8
V
Div. by 4 Threshold
1.5
3.5
V
Div. by 8 Threshold
Volts Below V
REF
0.20
0.8
V
Sense Amplifier
Threshold Voltage
Percent of V
REF
27
30
33
%
Threshold Hysteresis
10
mV
Input Bias Current
Input = 1.5V
-1.0
-0.2
A
Two Phase Drive Outputs, A and B
Saturation Voltage
I
OUT
= 16mA
0.3
0.6
V
Leakage Current
V
OUT
= 15V
0.1
5.0
A
Disable Input
Input Current
Input = 5V (Disabled, A and B Outputs Active Low)
150
500
A
Input = 0V (Enabled)
-5.0
0.0
5.0
A
Threshold Voltage
0.5
1.6
2.2
V
Phase Detector
High Output Level
Positive Phase / Freq. Error, Volts Below V
REF
0.2
0.5
V
Low Output Level
Negative Phase / Freq. Error
0.2
0.5
V
Mid Output Level
Zero Phase / Freq. Error, Percent of V
REF
47
50
53
%
High Level Maximum Source Current
V
OUT
= 4.3V
2.0
8.0
mA
Low Level Maximum Sink Current
V
OUT
= 0.7V
2.0
5.0
mA
Mid Level Output Impedance (Note 3)
I
OUT
= -200 to +200
A, T
J
= 25C
4.5
6.0
7.5
k
Lock Indicator Output
Saturation Voltage
Freq. Error, I
OUT
= 5mA
0.3
0.45
V
Leakage Current
Zero Freq. Error, V
OUT
= 15V
0.1
1.0
A
Loop Amplifier
N INV. Reference Voltage
Percent of V
REF
47
50
53
%
Input Bias Current
Input = 2.5V
-0.8
-0.2
A
AVOL
60
75
dB
PSRR
+V
IN
= 8V to 15V
70
100
dB
Short Circuit Current
Source, V
OUT
= 0V
16
35
mA
Sink, V
OUT
= 5V
16
30
mA
Buffer Op-Amp
Input Offset Voltage
V
CM
= 2.5V
8
mV
Input Bias Current
V
CM
= 2.5V
-0.8
-0.2
A
PSRR
+V
IN
= 8 to 15V
70
100
dB
CMRR
V
CM
= 0 to 10V
70
100
dB
Short Circuit Current
Source, V
OUT
= 0V
16
35
mA
Sink, V
OUT
= 5V
16
30
mA
Note 3: These impedance levels will vary with T
J
at about 1700ppm/C.
Note 4: This part is also available in a 20 pin plastic leadless chip carrier, Q designator, where a divide by 4/5 select pin is available.
Consult factory for details.
UC1634
UC2634
UC3634
Unless otherwise stated, these specifications apply for T
A
= 0C to +70C for the
UC3634, -25C to + 85C for the UC2634 and -55C to +125C for the UC1634,
+V
IN =
12V. T
A
=T
J
ELECTRICAL CHARACTERISTICS:
3
UC1634
UC2634
UC3634
APPLICATION AND OPERATION INFORMATION
(For additional information see UC1633 data sheet)
Design Example:
Precision phased locked frequency control of a 2-phase motor at 3600 RPM. Using the commutation logic on the
UC3634, a simple discrete drive scheme is possible.
UNITRODE INTEGRATED CIRCUITS
7 CONTINENTAL BLVD.
MERRIMACK, NH 03054
TEL. (603) 424-2410
FAX (603) 424-3460
4
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